Noah's Family and Nephilim
According to Gen. 6:9 and 7:1, only Noah’s family escaped Nephilim seed infiltration.
The conclusion, therefore, is that only his family (i.e. wife and daughters) were not corrupted by Nephilim seed!
The Hebrew word “Tamim” is used = as “without blemish as to breed or pedigree”.
That means that all flesh was corrupted except for Noah’s family.
The importance of this is conveyed by the meaning of Gen.3:15, which had its fulfilment in Christ Jesus!